Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dee32b7b75d491d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-11 02:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 982a91f807bef5ddc2b6ef17b2a6401a SHA-1: 7ec1fa13e622b3adb88d5842ca7ad80296e73621 SHA-256: 9dee32b7b75d491d5bd54f5b58c062827f8472394ef0a39571973595fdd3bf94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://szao-spb.ru/images/news/file/49877882298.pdf In PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/lovasewigefet.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/79623399163.pdfIn PDF document text
    • http://trieuduong.com/images/Download/35415374126.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/74989941718.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/71822365244.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135889e431be---52647950281.pdfIn PDF document text
    • http://24cvety.ru/upload/files/geruxoxoduzut.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/jexugokirixux.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/xavezularupolafapum.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/nusenixugutaj.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/fekewezujularidubuko.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134491b0da08---15971291450.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/miluvijagugarotuwi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1ee83e16---69808366129.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/dasamakakizajezuv.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210910215245.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca7aa913d---duworusurubug.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/gapajumedejuwewigados.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/xubivekuvuguzunadenereso.pdfIn PDF document text
    • https://badoza.net/userfiles/file/97825870661.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/88154839750.pdfIn PDF document text
    • http://saaretravel.ee/images/file/50078850903.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee9c4fc1d---61551486724.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/nafavigubex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=summary+of+chapter+8+the+giverPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BD 16488 bytes
SHA-256: 1adf281358a1bac9f4e3001313aa396eb510fd3527245e4f9620ad1b06784fbd
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 11172 bytes
SHA-256: d6c0a95ec868bfbb0ce65313f064d26a283502aa9173af1d3c97c645ba73755d

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